Merge pull request #19 from marcuswu0814/feature/AddingDelegateAsPara…

…mToHelperExtension

Adding delegate as an optional param to UIViewController extension

ContextMenu/UIViewController+Extensions.swift

@@ -17,17 +17,20 @@ extension UIViewController {
     ///   - viewController: A content view controller to use inside the menu.
     ///   - options: Display and behavior options for a menu.
     ///   - sourceView: A source view for menu context. If nil, menu displays from the center of the screen.
+    ///   - delegate: A delegate the receives events when the menu changes.
     public func showContextualMenu(
         _ viewController: UIViewController,
         options: ContextMenu.Options = ContextMenu.Options(),
-        sourceView: UIView? = nil
+        sourceView: UIView? = nil,
+        delegate: ContextMenuDelegate? = nil
         ) {
 
         ContextMenu.shared.show(
             sourceViewController: self,
             viewController: viewController,
             options: options,
-            sourceView: sourceView
+            sourceView: sourceView,
+            delegate: delegate
         )
     }
 }